For loop that keeps only the first result of a random number generator function for all the loop runs

Hi,I have this for loop

function[result]=temperature_grid(f,X,Y)
for i=1:length(Y)
  for j=1:length(X)
result(i,j) = f(X(j),Y(i))
end
end

where the f is this random generator function which I call function[re]=tmprtr(X,Y)

Kx=randi([1,5]);
Lx=randi([1,5]);
Ky=randi([1,3]);
Ly=randi([1,3]);
re=111 .*e.^(-0.3.*(((X-Lx).^2)+0.6 .*((Y-Ly).^2)))+66 .*e.^(-0.2 .*(((X-Lx).^2)+1.6 .*((Y-Ly).^2)));

I want it to produce only once random numbers and use these same numbers for all the other runs of the loop but now with every run of the loop it creates new random numbers which is something I don't want...Do you have any ideas how to make it work?

Answer 1

[Cris LaPierre]

You would have to generate the random numbers before entering the loop, or inside an if statement inside the loop that only executes if the loop counter is 1.

Answer 2

[Adam Danz]

Select a random seed for the generator and reset the generator every time you want to repeat the same results.

https://www.mathworks.com/help/matlab/math/generate-random-numbers-that-are-repeatable.html

Seeds can be any positive integer up to 2^32-1 so you can select a seed using

randSeed = randi(2^32-1);
rng(randSeed,'twister')

or

rng('default')
rng(randSeed)

Answer 3

[Bulldog]

thanks for the answers